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180=57+x+23
We move all terms to the left:
180-(57+x+23)=0
We add all the numbers together, and all the variables
-(x+80)+180=0
We get rid of parentheses
-x-80+180=0
We add all the numbers together, and all the variables
-1x+100=0
We move all terms containing x to the left, all other terms to the right
-x=-100
x=-100/-1
x=+100
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